Preparation and Lithium Storage Performance of MWCNT@SiO2 Coaxial Nanocables†

doi:10.7503/cjcu20140352

Abstract

Abstract:

MWCNT@SiO₂ coaxial nanocables were prepared via a facile hydrolysis-condensation process of tetraethyl orthosilicate(TEOS) with multi-walled carbon nanotubes(MWCNT) as templates. The morphology, structure and electrochemical performance of the nanohybrids were characterized by transmission electron microscopy(TEM), scanning electron microscopy(SEM), and electrochemical measurements. It is indicated that the MWCNT templates have been fully wrapped by SiO₂ layer with uniform thickness and porous nature, which is beneficial for the enhanced Li-storage capabilities of the MWCNT@SiO₂ nanohybrids. When evaluated as anode materials for Li-ion battery, the MWCNT@SiO₂ coaxial nanocables exhibit high specific capacities and excellent cycling performance. For example, the MWCNT@SiO₂ coaxial nanocables are able to deliver a high discharge capacity of 431.7 mA·h/g after 80 cycles at a current density of 100 mA/g, which is higher than the theoretical capacity of graphite(372 mA·h/g). The facile synthetic methodology and enhanced lithium-storage performances of the MWCNT@SiO₂ coaxial nanocables make it an ideal anodic candidate for high-energy and long-life Li-ion batteries(LIBs).

Key words: Li-ion battery, Anode material, MWCNT@SiO₂, Coaxial nanocable, Hydrolysis-condensation reaction

CLC Number:

O646

TrendMD:

SHI Huimin, WANG Hui, YIN Jinwei, ZHU Qingyun, WU Ping, Tang Yawen, Zhou Yiming, Lu Tianhong. Preparation and Lithium Storage Performance of MWCNT@SiO₂ Coaxial Nanocables^†[J]. Chem. J. Chinese Universities, 2015, 36(1): 175.

Figures/Tables 6

Fig.1 XRD patterns of the pristine MWCNT(a) and MWCNT@SiO2 coaxial nanocables(b)

Fig.2 SEM(A, C) and TEM(B, D) images of the pristine MWCNT(A, B) and MWCNT@SiO2 coaxial nanocables(C, D) Insets in (A) and (C) are the magnified SEM images of the white rectangular regions.

Fig.3 TEM images with different magnification(A, B) and corresponding elemental mappings of Si(A1, B1), O(A2, B2), C(A3, B3) and their overlap(A4, B4) of the MWCNT@SiO2 coaxial nanocables

Fig.4 TGA curve of the MWCNT@SiO2 coaxial nanocables

Fig.5 The first three CV curves of the MWCNT@SiO2 coaxial nanocables in the potential range of 0—3.0 V(scan rate: 0.1 mV/s)

Fig.6 Discharge/charge capacities(A) and Coulombic efficiencies(B) for the pristine MWCNT and MWCNT@SiO2 coaxial nanocables in potential range 0—3 V(current density: 100 mA/g)

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Preparation and Lithium Storage Performance of MWCNT@SiO₂ Coaxial Nanocables^†

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